Practicing Success
The average age of a group of 35 persons was 52 years, Five persons left the group and due to this the average age of the remaining persons in the group increased by 3 years. What is the average age ( in years) of the persons who left the group ? |
34 38 42 43 |
34 |
Average age = \(\frac{Total \;age \;of\; all }{Total \;number\;of \;person}\) 52 = \(\frac{Total \;age \;of\; all }{35}\) Sum of age of 35 persons = 52 × 35 = 1820 Five person left the group , Number of remaining persons = 35 - 5 = 30 ( 52 + 3 ) = \(\frac{Total \;age \;of\; all }{30}\) 1650 = Total age of 30 persons Age of 5 persons who left the group = 1820 - 1650 = 170 Average age of these 5 persons = \(\frac{170 }{5}\) = 34 The correct answer is option (1) : 34 |